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21. How do hair inside the nose help us? A. It collects air. B. It filters the dirt C. It's an additional beauty. 22. Which of the following sentences is right? A. Remove the hair in your nose B. Pick booger using a clip C. Gently blow your colds. 23. What kind of cloth should we use in cleaning our nose? A. dirty B. rough C. soft 24. Which of the following is fragrant? A. fish B. flower C. trash​